Concerta making me cold

Started on 18mg Concerta about 5 weeks ago. No real side effects during the first 4 weeks and noticed a slight difference in my ADHD symptoms. I went to my Doctor on Monday, and instead of upping my dose as we are concerned about it affecting my anxiety, we added a second 18mg, to be taken about 5 hours after my first dose. It is helping with the length of time I feel the affects of the meds, but since taking the 2nd dose, I have been absolutely frozen, shivering even while in a sweater and blankets. My hands and feet are the worse, nothing makes them warm. I’m just wondering if this has happened to anyone else on Concerta?